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If before it was going rather bright red or a version of that--it is related to the circuit for the red picture tube this set uses---the tube itself or the circuit board that plugs onto the end of that tube.

If bright red, green or blue screen set will detect too much current being drawn and blank or turn tubes off; not likely a do it yourself repair and this set is prone to this and many other problems---Just Google the model number with "problems" and see what I mean.

The 41 was quite prone to blowing the crank seal on the flywheel side, remove the flywheel and check, at the same time check the flywheel key has not sheared, behind the carb fixing plate is a rubber induction tube, make sure this has not split, als check the impulse seal underneath the induction tube.

THAT KIND OF TECHNOLOGY IS PRONE TO WHAT ARE CALLED CONVERGENCE FAILURES. PROBABLY THE MOST COMMON FAILURE HAS TO DO WITH THE CIRCUIT THAT KEEPS THE 3 PICTURES FROM EACH OF THE PICTURE TUBES ALIGNED TOGETHER.

Sounds like it is the tube to part of your emissions equipment. It usually goes to another hose that goes to a one way valve from the air pump for the air injection for your exhaust gas recirculation system. These are prone rust and can be purchased from Ford for replacement.